If you are asking NP, this is the amount used with your zeolite flow rate, the added dose and the use of the base product 4, etc.

Need G. Adjust the use of your base product 4 from the depths, as well as the dosage

How do you reduce PO4?
If you use additional components, you need to slowly remove them periodically and use Start3 to avoid measurable values ​​in the process.

…

Try to answer you, you need to measure the potassium value, it has no direct relationship with NP, but there is an indirect relationship between coral health and appearance. For example, the K+ level is very low, which will lead to unhealthy corals and gradually TN